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  1. G

    Measuring Zs

    Hi When measuring maximum earth fault loop impendance Zs on a light circuit, do you measure on a 3 plate pendant between loop and earth or live and earth Thanks for you assistance.
  2. G

    Unswitched Fuse

    Is it possible to have a High level unswitched fuse as a connection for a radiant heater in the bathroom off of the ring main
  3. G

    Drilling zones in "I Joist"

    Can anyone please tell me if the drilling zone through an I Joist is the same as the zone through a standard timber joist ie: 0.25 - 0.40, as I Joist have knock out holes all throughout its length. Thanks for your assistance.
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